Respuestas

2011-12-04T22:36:58+01:00

4 amigos = 3750

 

a + b +c +d = 3750

 

a=2b

b=30 + c

c= d/2            entonces:

 

a=2b      b-30=c     b=b       b-30=d/2

                                         2(b-30)=d

 

                      reemplazas:

 

2b + b +b-30 + 2b - 60 = 3750

6b - 90 =3750

6b = 3840

3b= 1920

b=640 euros

 

si a b le toca 640 euros, entonces: a = 1280

                                                    c =  610

                                                    d =  1220